Diabetes Care, Vol 20, Issue 6 992-994, Copyright © 1997 by American Diabetes Association
Glipizide-GITS does not increase the hypoglycemic effect of mild exercise during fasting in NIDDM
MC Riddle, PA McDaniel and LA Tive
Department of Medicine, Oregon Health Sciences University, Portland 97201, USA.
OBJECTIVE: This study compared the effect of mild exercise while fasting on
plasma glucose concentrations in subjects with NIDDM treated with
extended-release glipizide and subjects not taking an oral hypoglycemic
agent. RESEARCH DESIGN AND METHODS: Twenty-five moderately obese subjects
with NIDDM were randomized to treatment with extended-release glipizide or
placebo. After 9 weeks of treatment, they fasted overnight, took their
study drug, omitted breakfast, and exercised on a treadmill for 90 min.
Glucose, insulin, and C-peptide concentrations were measured before,
during, and after exercise. RESULTS: On the fasting-exercise day, fasting
glucose concentrations were lower (153 vs. 241 mg/dl, P < 0.01) and
insulin and C-peptide concentrations higher in the extended-release
glipizide group. The decrement of glucose from the fasting baseline was
modest and equivalent in the two groups: 17 vs. 21 mg/dl at the end of
exercise and 28 vs. 27 mg/dl after 2 h of recovery. No subject had
hypoglycemic symptoms. CONCLUSIONS: Chronic use of extended-release
glipizide does not enhance the hypoglycemic effect of fasting plus mild
exercise for people with NIDDM. Routine lifestyle treatments for NIDDM may
be continued during ongoing use of this agent.